Showerhead filter



FIG. 1 is a perspective view of the instant novel design for ashowerhead filter.

FIG. 2 is a front elevational view thereof in which all other sideelevational views thereof are identical.

FIG. 3 is a top view of the filter system; and,

FIG. 4 is a bottom view thereof.

The ornamental design for a showerhead filter, as shown and described.